Forget all the junk cooling fans you see on ebay and shipping from HK for $1.00. You will get what you pay for- junk. They break after a few weeks and have low or no airflow. Why? They are junk.This is a high quality cooling system made by Innovation with a super sized 3 1/2" Fan.It comes with it"s own power supply and will last virtually forever!It weighs near 4 lbs!11"L x 8" W x 3" H Keeps your system 30 degrees cooler during use! Circulates the air flow completely throughout your system! Adds thousands of hours of life to your system! Sixty thousand hours of fan life means you can play and cool forever! Prevents overheating and permanent damage to your system! If you are not using this product you are slowly killing your system!